Trimming-machine



LUND. I TRIIVIMING MACHINE. APPLICATION FILED MAY 4. 1918.

Patented J an. 20, 1920.

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I s L v I` II l IIIIII I I I j` :III l :IMM

T.. LUND. TRIMIVHNG MACHINE.

APPLICATION FILEDv MAY 4| 1918- 1,328,531, Patented Jan. 20,1920.

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UNITED STATES PATENT OFFICE.I

THOMAS LUND, OF BEVERLY, MASSACHUSETTS, .ASSIGNOR TO UNITED SI-IOE MACHIN- ERY CORPORATION, OF PATERSN, NEW JERSEY, A CORPORATION OF NEXV JERSEY.

TRIMMING-MACI-IINE.

Specification of Letters Patent.

Patented Jan. 20, 1920.

Applieation fued May 4, 191s. serial No. asztoo.

To aZZ whom t may concern:

Be it known that I, THOMAS LUND, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Trimming- Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to trimming machines and is shown as embodied in :a machine especially designed for trimming heels of boots and shoes.

`Machines used for trimming the heels of shoes comprise generally a rand guard and a toplift guard. The rand guard enters the rand crease and supports the shoe at this point, and the toplift guard supports the toplift on its side and bottom. The shoe is turned by the workman, keeping the guards in Contact with the rand crease and the toplift, and is thus presented to the cutter which rotates between the guards. The toplift guard is preferably adjustable longitudinally and transversely of the cutter axis, in order to insure the trimming of the heel flush with the toplift, which will preferably have been shaped to the desired form before attachment to the shoe, and in machines at present obtainable the toplift guard as a whole has only these two movements.

ThisV necessitates the rubbing and slipping of the toplift over the toplift guard as the shoe is turned to carry the cutter around the heel, thus wasting the operators energy, particularly' whenv the toplift is of rubber, which does not slide easily on the guard. Toplift guards rotatable about the axisv of the cutter have been proposed but they have not'had the combination of adjustments described,'and havebeen so formed as to be very wasteful of material and clumsy, for which and other'reasons such guards have never gone into actual use.

It is an object of my invention to provide a toplift guard whichshall obviate the difficulty due to friction described, and which shall at the same time preserve among others all the advantages of both kinds of adjustment lwhich have been recognized as desirable.

Accordingly a lfeature of the invention consists ina toplift guard mounted so as. to

be adjustable both longitudinally and transversely of the cutter-axis, and at the same time movable relatively to the cutter, while in operation, in response to the tractive action of the toplift. The guard therefore utilizes the advantages of rolling' contact with. the toplift without sacrificing the advantages of adjustment in both of the manners hereinbefore described.

Another feature of the invention consists in a toplift guard which is movable from normal position under the friction exerted by the shoe and which automatically returns to normal position when the shoe is removed. In the machine shown, the guard is resiliently mounted for movement under the frictional force exerted on it by the shoe.

It is desirable and convenient to have the toplift guard arranged so that it may be attached to and detached from the machine without dismantling other parts of the machine, especially the cutter shaft and the cutter carried thereby, since it may happen from time to time that the guard may require cleaning, lubricating and inspection. Accordingly a feature of the invention consists in mounting the toplift guard independently of the cutter and cutter shaft so that the operations of mounting and dismounting the guard may be performed without disturbing the cutter or the shaft.

These and other features of the invention comprising various combinations and arrangements of parts will be better understood from the following description of a preferred embodiment thereof selected for purposes of illustration and shown 4in the drawings in which,

Figure 1 is a plan view and Fig. 2 is a rear view of the improved toplift guide. Fig. 3 is a rear view and Fig. 4 is' a section of a modified form. The head 10 of the machine carries a bearing for the shaft 12. The shaft 12 carries two relatively adjustable cutter-carrying plates 14 and 16 between which are mounted the cutter blades 18. The rand guard 20 is rotatably mounted on ahead 22 which is swingably mounted by means of adjustable links 24 and 26 upon a head 28 whichy is adjustable parallel and transversely to the Vshaft 12 by means of the screws 30 and 32. These parts are all of Well-known construction. f

The head 10 carries a slide 34 which is adjustable, parallel to thev shaft by means Vof -64 on a fixed part of the machine.

the rack operated by a thumb screw 36 and having a clamp nut 38. The slide 34 carries a head 4() which is adjustable transversely to the shaft 12 by means of the thumb screw 42 and the slide 44. The segmental toplift guard 46 is mounted upon the head 40. The rear side of the toplift guard has formed upon it a cylindrical surface 48 substantially concentric with the shaft 12, which is arranged beside a concentric cylindrical li 50 on the head 40. The inner side of the lip carries a plate 52 fastened to it by screws 54. The surface 48 and the plate 52 form an annular space for a segmental cage 56 Containing balls which run in a groove 58 in the cylindrical surface 48. The cage is preferably fastened to the guard 46. The guard 46 has a lip 59 which rests upon a laterally extending lip on the edge of the plate 52. The guard is thus held against movement perpendicular to the shaft 12 and is held from movement parallel to the shaft by the balls and ball race 58. It can, however, rotate freely around the shaft 12. The toplift guard has two pins 60 to which the ends of springs 62 are attached, the other ends of the springs being fastened to pins The springs 62 keep the guard 46 normally in a mean position but when a shoe is presented to the machine as shown in Fig. 1 and turned to trim progressively, the friction between the toplift 66 and the toplift guard 46 rotates the guard instead of opposing the turning movement of the shoe. This avoids rubbing the edge of the toplift and avoids the opposition to movement that would be lncurred with a non-turning guard. Such opposition has been great when operating upon heels that have toplifts made of rubber, and has caused uneven work and unnecessary fatigue to the operative.

.F1gs. 3 and 4 show a mechanically superlor design of guard. The head 40 has a lip 66 having a ball race, and carries the plate 67 having two ball races, extending parallel to the lip 66 from the other side of the head. The guard 46 has a segmental flange 69 with three corresponding ball races, extending between the lip 66 and plate 67. The cages 68 hold the balls and the guard is retained in position by the balls and races, though free to turn.

The segmental form of the toplift guard permits its inner edge to be made on the saine curvature as the plate 14. If the guard were a complete circle in form, it could not be transversely adjustable without a substantial enlargement in inside diameter with consequent departure from the curvature of the plate 14. Uneven trimming around the toplift would result since the point of finishmg contact with the cutter is not vertically fixed as the heel turns. The present invention thus provides a rotary guard which is at the same time adjustable and sacrifices none of the advantages of guards heretofore in use.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. In a machine of the class described, a cutter, and a segmental toplift'guard supported so as to be adjustable transversely of the axis of the cutter and movable about an axis by friction between the guard and a heel whereby frictional drag on the shoe is avoided as the shoe is turned to trim the heel progressively.

2. In a machine of the class described, a

cutter, and a segmental toplift guard supported so as to be radially adjustable 'relatively to the cutter and movable about'an axis by friction between the guard and the shoe whereby frictional drag on the shoe is avoided as the shoe is turned to trim the heel progressively.

3.' In a machine of the class described, a cutter, and a toplift guard adjustable axially and transversely in relation tothe cutter and movable relatively to the cutter by friction between the guard and the shoe whereby frictional drag on the shoe is avoided as the shoe is turned to trim the heel progressively.

4. In a machine of the class described, a cutter, and a toplift guard constructed and arranged to move from normal position under the force exerted upon it by the shoe in turning-to present the heel to the cutter and to return automatically to normal position when the shoe is removed.

5. In a machine of the class described, a cutter, and a toplift guard resiliently supported against movement tangentially to the direction of movement of the cutter, whereby frictional drag between the guard and the shoe is avoided.

6. In a machine of the class described, a cutter, a toplift guard carrier having a segmental guide, and a toplift guard mounted on the guide constructed and arranged to move thereon under the friction exerted by the shoe while turning, and to return automatically to normal position when the shoe is removed.

7. In a machine of the class described, a cutter, and a toplift guard adjustable in different planes relatively to the cutterand rotatable about an axis substantially parallel to that of the cutter, whereby frictional drag on the toplift is avoided as the shoe is turned to trim the heel progressively.

8. In a machine of the class'described, a cutter, a toplift guard, and a compound support for the guard comprising two adjustable supporting elements one of which' is carried by the other so as to partake of the adjusting movement of said other and being otherwise. adjustable independently of said.

other, the guard being arranged to partake of adjustment of both said supporting elements and being constructed and arranged to have rolling contact With the toplift as the shoe is turned to trim the heel progressively.

9. In a machine of tlre class described, a cutter, a toplift guard constructed and arranged to 4roll in contact With a toplift, means arranged to adjust said guard longitudinally of the cutter axis, and means arranged to adjust the guard transversely of said axis.

10. In a machine of the class described, a cutter-shaft, a cutter carried thereby, a toplift guard, and means arranged to support said guard so that the latter may be mounted and dismounted independently of the cutter and cutter-shaft, the guard being constructed and arranged to roll in contact With the toplift as the shoe is turned to trim the heel progressively.

In testimony whereof I have signed my name to this specification.

THOMAS LUND. 

